21910002191 has 16 divisors (see below), whose sum is σ = 27403669248. Its totient is φ = 17018164800.

The previous prime is 21910002161. The next prime is 21910002199. The reversal of 21910002191 is 19120001912.

It is not a de Polignac number, because 21910002191 - 2¹⁴ = 21909985807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21910002191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21910002199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430445 + ... + 478646.

It is an arithmetic number, because the mean of its divisors is an integer number (1712729328).

Almost surely, 2^21910002191 is an apocalyptic number.

21910002191 is a deficient number, since it is larger than the sum of its proper divisors (5493667057).

21910002191 is a wasteful number, since it uses less digits than its factorization.

21910002191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909422.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 21910002191 in words is "twenty-one billion, nine hundred ten million, two thousand, one hundred ninety-one".